Feasibility of High-Resolution PET Detector Readout by 2-D Tetra-Lateral Position-Sensitive Silicon Photomultiplier

In this paper, we present the feasibility of high-resolution PET detector readout by a 2-D tetra-lateral position-sensitive Silicon photomultiplier with an intrinsic cap resistive layer for charge division (CRL-SiPM). The scintillation imaging sensor for 511 keV gamma ray detection is realized by coupling a 5 $\times $ 5 array of 0.45 $\times $ 0.45 $ \times $ 6 mm3 LYSO crystals to the CRL-SiPM with an active area of 2.77 $ \times $ 2.77 mm2 and micro APD cell pitch of $ \sim 10~ \mu \text{m}$ . The scintillator arrays are clearly distinguished and good scintillator array imaging with little position distortion has been achieved. An energy resolution of ~13.5% and coincidence time resolution of 555 ps are demonstrated, respectively. Therefore, the potential PET imaging sensor with greatly reduced readout channels has been verified.